package com.dooapp.gaedo.finders.expressions;
import java.lang.reflect.Field;
import com.dooapp.gaedo.finders.QueryExpression;
import com.dooapp.gaedo.finders.informers.MapContainingValueExpression;
import com.dooapp.gaedo.properties.Property;
public class ToStringVisitor implements QueryExpressionVisitor {
private static final String NULL = "***null***";
private String indent = "\t";
private int deepness = 0;
private StringBuilder out = new StringBuilder();
private StringBuilder deepnessString() {
StringBuilder sOut = new StringBuilder();
for (int i = 0; i < deepness; i++) {
sOut.append(indent);
}
return sOut;
}
public void endVisit(OrQueryExpression orQueryExpression) {
deepness--;
}
public void endVisit(AndQueryExpression andQueryExpression) {
deepness--;
}
public void endVisit(NotQueryExpression notQueryExpression) {
deepness--;
}
public void startVisit(OrQueryExpression orQueryExpression) {
out.append(deepnessString()).append("OR").append("\n");
deepness++;
}
public void startVisit(AndQueryExpression andQueryExpression) {
out.append(deepnessString()).append("AND").append("\n");
deepness++;
}
public void startVisit(NotQueryExpression notQueryExpression) {
out.append(deepnessString()).append("NOT").append("\n");
deepness++;
}
@Override
public void visit(AnythingExpression expression) {
out.append(deepnessString()).append(
getFieldText(expression)).append("\tis anything (yep, really anything)")
.append("\n");
}
public void visit(EqualsExpression expression) {
out.append(deepnessString()).append(
getFieldText(expression)).append("\t==?\t")
.append(unNull(expression.getValue()).toString()).append("\n");
}
/**
* Get text associated to field part of basic expression
* @param expression input expression
* @return a view of the field
*/
private String getFieldText(AbstractBasicExpression expression) {
Property f = expression.getField();
if(f==null)
return "this";
else
return f.toGenericString();
}
@Override
public String toString() {
return out.toString();
}
/**
* Replace a potentially null value with a non null one
* @param value
* @return the value {@value #NULL}
*/
private Object unNull(Object value) {
return value==null ? NULL : value;
}
public <ComparableType extends Comparable<ComparableType>> void visit(GreaterThanExpression<ComparableType> greaterThanExpression) {
out.append(deepnessString()).append(
getFieldText(greaterThanExpression)).append(
">").append(greaterThanExpression.isStrictly() ? "" : "=")
.append("?")
.append(unNull(greaterThanExpression.getValue()).toString()).append(
"\n");
}
public <ComparableType extends Comparable<ComparableType>> void visit(LowerThanExpression<ComparableType> lowerThanExpression) {
out.append(deepnessString()).append(
getFieldText(lowerThanExpression)).append(
"<").append(lowerThanExpression.isStrictly() ? "" : "=")
.append("?").append(unNull(lowerThanExpression.getValue()).toString())
.append("\n");
}
@Override
public void visit(EqualsToIgnoreCaseExpression expression) {
out.append(deepnessString()).append(
getFieldText(expression)).append(
" ==(a==A)? ").append(expression.getCompared()).append("\n");
}
@Override
public void visit(ContainsStringExpression expression) {
out.append(deepnessString()).append(
getFieldText(expression)).append(
" contains? ").append(expression.getContained()).append("\n");
}
@Override
public void visit(StartsWithExpression expression) {
out.append(deepnessString()).append(
getFieldText(expression)).append(
" startsWith? ").append(expression.getStart()).append("\n");
}
@Override
public void visit(EndsWithExpression expression) {
out.append(deepnessString()).append(
getFieldText(expression)).append(
" endsWith? ").append(expression.getEnd()).append("\n");
}
@Override
public void visit(CollectionContaingExpression expression) {
out.append(deepnessString()).append(
getFieldText(expression)).append(
" contains? ").append(unNull(expression.getContained()).toString()).append("\n");
}
@Override
public void visit(MapContainingValueExpression expression) {
out.append(deepnessString()).append(
getFieldText(expression)).append(
" containsKey? ").append(unNull(expression.getContained()).toString()).append("\n");
}
@Override
public void visit(MapContainingKeyExpression expression) {
out.append(deepnessString()).append(
getFieldText(expression)).append(
" containsValue? ").append(unNull(expression.getContained()).toString()).append("\n");
}
@Override
public void visit(MatchesRegexpExpression expression) {
out.append(deepnessString()).append(
getFieldText(expression)).append(
" matches? ").append(expression.getPattern().toString()).append("\n");
}
@Override
public void visit(InstanceOfExpression expression) {
out.append(deepnessString()).append(
getFieldText(expression)).append(
" instanceof? ").append(expression.getType().getName()).append("\n");
}
}